Add attributes from the original obligation of
org.herasaf.xacml.core.policy.impl.ObligationType into the
org.opensaml.xacml.policy.ObligationsType.
Note that the latter does not support multi-valued attributes (it only has
setValue(String)) so we warn and just take the first value.
For the datatype we use getDatatypeURI() which hopefully is the correct one.
Merge pull request #1 from msalle/EMI-3

Add attributes from the original (heras)obligation into the opensaml XACML obligation